US20080241384A1 - Lateral flow deposition apparatus and method of depositing film by using the apparatus - Google Patents
Lateral flow deposition apparatus and method of depositing film by using the apparatus Download PDFInfo
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- US20080241384A1 US20080241384A1 US12/058,364 US5836408A US2008241384A1 US 20080241384 A1 US20080241384 A1 US 20080241384A1 US 5836408 A US5836408 A US 5836408A US 2008241384 A1 US2008241384 A1 US 2008241384A1
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/455—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for introducing gases into reaction chamber or for modifying gas flows in reaction chamber
- C23C16/45523—Pulsed gas flow or change of composition over time
- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45527—Atomic layer deposition [ALD] characterized by the ALD cycle, e.g. different flows or temperatures during half-reactions, unusual pulsing sequence, use of precursor mixtures or auxiliary reactants or activations
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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- C23C16/45504—Laminar flow
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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- C23C16/45525—Atomic layer deposition [ALD]
- C23C16/45544—Atomic layer deposition [ALD] characterized by the apparatus
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- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
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- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
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- C23C16/4584—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally the substrate being rotated
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Definitions
- the present invention relates to a lateral flow deposition apparatus and a method of depositing a film by using the apparatus.
- ALD atomic layer deposition
- gas pulses consisting of four sequential steps including first reactant gas supply, inert purge gas supply, second reactant gas supply, and inert purge gas supply are repeated.
- a pulse of a purge gas between the pulses of the different reactants reduces the gas phase reactions of the reactants due to excess amounts of the reactants remaining in the chamber such that a thin film is formed by a surface reaction occurring on the surface of the substrate.
- a portion of the reactant gases may be activated by plasma.
- a plasma atomic layer deposition method of generating discontinuous plasma in line with the pulses of the reactant gases in a reaction chamber is disclosed in Korean Patent No. 273473 and U.S. Pat. No. 6,645,574.
- a lateral flow ALD reactor in which gases flow laterally over and parallel to the surface of a substrate, has been proposed.
- flow of the gases is rapid and simple and thereby reactant gases can be switched and purged rapidly to reduce time required for supplying process gases sequentially.
- An example of lateral flow reactor suitable for time-divided gas supplying ALD method and a method of depositing a thin film using the lateral flow reactor have been disclosed in Korean Patent No. 624030 and U.S. Pat. No. 6,539,891.
- the plasma atomic layer deposition method of generating discontinuous plasma may be applied to the lateral flow reactor by supplying RF power to the electrode in line with the pulses of the reactants gases.
- lateral flow ALD reactors have been disclosed in U.S. Pat. No. 5,711,811 and U.S. Pat. No. 6,562,140.
- the reactors have a constant gap between a portion supporting a substrate and another portion facing a surface of the substrate such that gas flowing over the substrate may be constant and maintained substantially laminar.
- One embodiment is a method of depositing a film over a substrate.
- the method includes in sequence: flowing one or more reactant gases horizontally over a substrate in a first direction relative to the substrate until a first film having a first thickness is formed over the substrate; stopping flowing the reactant gases over the substrate; and flowing the reactant gases horizontally over the substrate in a second direction relative to the substrate until a second film having a second thickness is formed over the first film.
- the first thickness is thinner than a target thickness.
- the second thickness is thinner than the target thickness.
- the second direction is different from the first direction.
- Another embodiment is a method of depositing a film over a substrate.
- the method includes in sequence: flowing one or more reactant gases horizontally over a substrate in a first direction in a first reactor to form a first film over the substrate; transferring the substrate from the first reactor to a second reactor; and flowing the same reactant gases horizontally over the substrate in a second direction in the second reactor to form a second film over the first film.
- the second direction is different from the first direction relative to the substrate.
- the first and second films are formed of the same material.
- Yet another embodiment is an apparatus for depositing a thin film over a substrate.
- the apparatus includes: a reaction chamber configured to define an enclosed reaction space in which deposition is performed on a substrate.
- the reaction space is configured to provide a laminar gas flow in a direction over the substrate.
- the apparatus further includes a driver configured to rotate the substrate while deposition is not performed on the substrate such that the orientation of the substrate relative to the direction of the laminar gas flow is different from the orientation of the substrate before being rotated.
- the apparatus includes a plurality of reaction chambers. Each of the reaction chambers is configured to define an enclosed reaction space in which deposition is performed on a substrate. The reaction space is configured to provide a laminar gas flow in a direction over the substrate. The reaction chambers are configured to provide the same reactant gases as one another into the reaction spaces.
- the apparatus also includes a transfer device configured to transfer a substrate from one of the reaction chambers to another of the reaction chambers. The orientation of the substrate relative to the direction of the laminar gas flow in the one reaction chamber is different from the orientation of the substrate relative to the direction of the laminar gas flow in the other reaction chamber.
- FIG. 1A and FIG. 1B are schematic plan views of a substrate illustrating a method of lateral flow deposition according to one embodiment.
- FIG. 2A and FIG. 2B are cross-sectional views of a lateral flow deposition apparatus according to one embodiment.
- FIG. 3 is a cross-sectional view of a lateral flow deposition apparatus according to another embodiment.
- FIG. 4A is a perspective view of a lateral flow deposition apparatus according to yet another embodiment.
- FIG. 4B is a top plan view of the lateral flow deposition apparatus of FIG. 4A .
- FIG. 5 is a schematic top plan view of a lateral flow deposition chamber having four reaction chambers according to yet another embodiment.
- FIG. 6 is a schematic plan view of a lateral flow deposition apparatus according to yet another embodiment.
- FIG. 7 is a schematic plan view of a deposition apparatus including four reaction chambers and a robot arm programmed to rotate the substrate between transfers according to yet another embodiment.
- Films deposited in the lateral flow deposition reaction chambers described above may have a non-uniform thickness.
- reactants typically flow from an upstream region to a downstream region in a chamber. Because a portion of the reactants is consumed for reaction with the surface of a substrate in the chamber while flowing from the upstream region to the downstream region, reactants are in a higher concentration in the upstream region than in the downstream region. Thus, a portion of the resulting film that is formed in the downstream region may be thinner than another portion of the film that is formed in the upstream region.
- Such effect is generally referred to as depletion effect.
- an ALD reaction exhibits non-ideal ALD behavior, such as CVD-type reactions between residual reactants or by-product and a subsequent pulse tend also to occur non-uniformly along the flow path.
- a film having a desired thickness is formed on a substrate through multiple steps.
- a film having a first intermediate thickness thinner than the desired thickness is formed on the substrate during one of the steps, which may be CVD or include multiple ALD cycles.
- the pre-formed film is grown to the desired thickness during one or more additional steps, each of which may be CVD or include multiple ALD cycles for depositing the same material.
- horizontal gas flows are provided over the substrate in different directions. These steps can be repeated until the film having the desired thickness is formed on the substrate. Because the substrate is exposed to gas flows in different directions during the multiple steps, depletion effects and/or other flow-axis non-uniformities on the substrate are averaged out. Thus, non-uniformity in thickness that would otherwise occur can be reduced or eliminated.
- a deposition method will be described with reference to FIGS. 1A and 1B .
- a film is grown to have a selected intermediate thickness, for example, up to about 50% of a desired final thickness, by reactant gases flowing over a substrate 10 in a first direction X.
- a first portion A of the substrate 10 is located at an upstream position, and a second portion B of the substrate 10 is located at a downstream position.
- the film is further grown to the desired final film thickness by reactant gases flowing over the substrate 10 in a second direction X′, as shown in FIG. 1B .
- the second direction X′ is opposite from the first direction X, and thus, the first portion A is now located at a downstream position, and a second portion B is now located at an upstream position.
- FIGS. 1A and 1B should be understood to illustrate relative directions. The same result can be achieved by rotating the substrate 180°, rather than changing the direction of the flow over a stationary substrate.
- a film is grown on a substrate to have a selected intermediate thickness in a first reactor, and then the substrate is transferred to a second reactor. In the second reactor, gases flow over the substrate 10 in the second direction X′ to form the other 50% of the desired film.
- the substrate 10 may be rotated by about 180° in a reactor with a lateral gas flow in the first direction X after a film is grown to have a selected intermediate thickness. By the rotation of the substrate 10 , the substrate 10 is now exposed to the same lateral gas flow, but in the opposite relative direction.
- the desired final thickness of the film may be divided into three.
- a film having a thickness of about one-third of the desired thickness may be formed on the substrate, and then the substrate may be rotated by about 120°. Then, a film having a thickness of about one-third of the desired thickness may again be formed on the substrate. Next, the substrate may be rotated by about 120° again, and a final one-third thickness of the film may be formed on the substrate.
- the desired final thickness of the film may be divided into n, and about 1/n of the desired thickness of the film may be formed (e.g., by CVD for a duration or multiple ALD cycles) in a reactor in which gases flow in a constant direction, and the substrate may be rotated by about 360°/n each time.
- the above process may be repeated n times to form the film having the desired thickness.
- n may be a natural number of 2 to 8, and particularly, n may be 2, 3, or 4.
- the desired thickness of the film may be divided into n, and about 1/n of the desired thickness of the film may be formed in a reactor in which gases flow in a constant direction. Then, the substrate may be transferred into another reactor in which gases flow in a direction rotated by about 360°/n from the gas flow direction of the previous reactor. The above process may be repeated n times to form the film having the desired thickness.
- n is a natural number of 2 to 8, and particularly n may be 2, 3, or 4.
- the deposition process of forming about 1/n of the desired thickness of the film in a reactor in which gases flow in a constant direction and rotating the substrate by about 360°/n may be repeated n times to form the film having the desired thickness.
- the deposition process of forming about 1/n of the desired thickness of the film in a reactor in which gases flow in a constant direction and transferring the substrate into another reactor in which gases flow in a direction rotated by about 360°/n from the gas flow direction in the previous reactor may be repeated n times to form the film having the desired thickness. Accordingly, a film having a substantially uniform thickness may be deposited in a lateral flow deposition apparatus.
- n is excessively large, the time required for rotating or transferring the substrate is excessively long such that productivity of the deposition chamber may be decreased.
- n is a natural number of 2 to 8, and preferably n is one of 2, 3, and 4, such that adverse effects on the productivity of the deposition chamber may be avoided.
- the number n can vary widely, depending on the deposition thickness and condition.
- the substrate and/or flow direction is rotated about 360° during the entire deposition process.
- a substrate and/or flow direction may be rotated more than 360° during the entire deposition process.
- a substrate and/or flow direction may be rotated about 360° ⁇ m, where m is equal to or greater than 2, depending on the desired film thickness.
- m is an integer less than or equal to 4 in order to minimize time lost during adjustment of relative flow direction.
- greater numbers of rotations m and/or greater numbers of rotational increments n will be beneficial.
- the substrate and/or flow direction can be rotated any suitable angle, depending on the desired film thickness and/or deposition chamber configuration.
- FIG. 2A and FIG. 2B are cross-sectional views of a lateral flow deposition apparatus according to one embodiment.
- FIG. 2A represents a lateral flow deposition apparatus during a depositing process
- FIG. 2B represents a lateral flow deposition apparatus during an interval between depositing processes.
- a lateral flow deposition apparatus 100 includes an outer wall 198 , a substrate holder 160 , and a reactor cover 101 .
- the reactor cover 101 and the substrate holder 160 together form a reaction chamber which defines a reaction space 151 in which a substrate 150 is processed.
- the deposition apparatus 100 also includes separate gas inlets 110 and 112 connected to the reactor cover 101 and configured to supply process gases into the reaction chamber, a gas outlet 120 connected to the reactor cover 101 and configured to exhaust gas from the reaction chamber, a substrate heater 170 configured to heat the substrate holder 160 , a substrate holder vertical movement mechanism configured to vertically move the substrate holder 160 and the substrate heater 170 , and a substrate rotary movement mechanism configured to rotate the substrate 150 relative to the direction of flow.
- One of the gas inlets 110 and 112 may be omitted.
- the reactor cover 101 may also include a cover heater 130 on outer surfaces of the reactor cover 101 to heat the reactor cover 101 .
- the lateral flow deposition apparatus 100 may also include gas flow control guide structures 140 and 142 in the reaction chamber.
- the gas flow control guide structures 140 and 142 are configured to generate a lateral gas flow over the substrate 150 .
- the lateral gas flow may be a substantially laminar flow.
- the substrate vertical movement mechanism may include three or more supporting rods 184 and 185 connected to the substrate holder 160 , and a driving device (not shown), such as a pneumatic cylinder.
- the driving device is configured to move the supporting rods 184 and 185 in a vertical direction.
- the substrate rotary movement mechanism may include a supporting pin 172 holding the substrate 150 , a supporting pin holder 173 in which the supporting pin 172 is inserted, and a supporting pin rotary movement mechanism connected to the supporting pin holder 173 .
- the supporting pin rotary movement mechanism may include an electric motor 175 such as a step motor, a feed-through 174 for rotation connected to the electric motor 175 , a fixing plate 176 equipped with the electric motor 175 , and a fixing rod 177 connected to the fixing plate 176 .
- the lateral flow deposition apparatus 100 may further include a supporting pin vertical movement mechanism (not shown) configured to move the supporting pin 172 in a vertical direction.
- the supporting pin vertical movement mechanism may include an electric motor and a pneumatic cylinder. Alternatively, the substrate can be lifted from the substrate holder 160 by interaction of the supporting pin 172 with the supporting pin holder 173 during downward movement of the substrate holder 160 .
- a part of the lower portion of the supporting pin 172 inserted into the supporting pin holder 173 is chamfered such that the lower portion below the supporting pin 172 does not have a complete cylindrical shape. Accordingly, a rotary motion of the supporting pin rotary movement mechanism is effectively transferred to the supporting pin 172 through the supporting pin holder 173 .
- the supporting pin 172 may be moved to a vertical direction along with the supporting pin holder 173 .
- the supporting pin rotary movement mechanism may include a device that is able to rotate by a predetermined angle using air pressure as well as electric means such as the electric motor 175 .
- a deposition method according to one embodiment using the lateral flow deposition apparatus shown in FIG. 2A and FIG. 2B will be described in detail.
- a substrate 150 is loaded onto the substrate holder 160 , in the position of FIG. 2B .
- the substrate holder 160 is moved upward to contact the reactor cover 101 to define a reaction space 151 in the position of FIG. 2A .
- a film having a thickness of up to about 50% of a desired final thickness is formed by sequentially supplying reactant gases, e.g., by CVD or in a plurality of ALD cycles alternating two or more reactants, into the reaction space 151 , as shown in FIG. 2A .
- the supply of the reactant gases is stopped and the substrate holder 160 is moved downward using the substrate holder vertical movement mechanism as shown in FIG. 2B .
- the supporting pin 172 interacts with the supporting pin holder 173 such that it is not moved downward such that the substrate 150 is detached from the substrate holder 160 .
- the electric motor 175 is rotated.
- the rotary motion of the motor 175 is transferred to the supporting pin 172 and the substrate 150 through the feed-through 174 such that the supporting pin 172 and the substrate 150 are rotated by about 180°.
- the substrate holder 160 is moved upward using the substrate holder vertical movement mechanism such that the substrate holder 160 contacts the reactor cover 101 to define the reaction space 151 , as shown in FIG. 2A .
- the preformed film is further grown, e.g., by CVD or another plurality of ALD cycles to deposit the same material to have the desired final thickness by sequentially supplying reactant gases into the reaction space 151 .
- the substrate holder 160 After the film having the desired thickness is formed, supply of the reactant gases is stopped and the substrate holder 160 is moved downward.
- the supporting pin 172 interacts with the supporting pin holder 173 such that it is not moved downward and the substrate 150 is detached from the substrate holder 160 .
- the substrate 150 is unloaded from the reactor using transfer equipment such as a robot arm (not shown), and another substrate may be loaded into the reactor.
- the robot arm may be disposed at a position in a reactor suitable for transferring the substrate, and then the supporting pin 172 , the supporting pin holder 173 and the supporting pin rotary movement mechanism may be moved downward by using the supporting pin vertical movement mechanism.
- the supporting pin 172 is moved downward and the robot arm supports the substrate 150 when it is detached from the supporting pin 172 .
- the robot arm is then moved outside of the reactor such that the substrate 150 is unloaded from the reactor and another substrate is loaded into the same position in which the supporting pin 172 supports the substrate 150 .
- the supporting pin 172 , the supporting pin holder 173 , and the supporting pin rotary movement mechanism are moved upward by using the supporting pin vertical movement mechanism such that the supporting pin 172 supports the new substrate and the robot arm is moved outside of the reactor.
- the substrate may be transferred without vertically moving the supporting pin 172 . Accordingly, the supporting pin vertical movement mechanism may be omitted.
- the supporting pin vertical movement mechanism may include an electric motor and a pneumatic cylinder.
- the substrate holder 160 is moved upward by using the substrate holder vertical movement mechanism such that the substrate holder 160 contacts the reactor cover 101 and the film having the desired thickness is deposited on the new substrate using the same method as described above.
- a film having a thickness of about 1/n of the desired thickness is formed on the substrate 150 in the reactor with gases flowing in a constant direction. After that, the supply of the reactant gases is stopped and the substrate 150 and the supporting pin 172 may be rotated by about 360°/n. The above process may be repeated n times to form a film having the desired thickness.
- the supporting pin rotary movement mechanism rotates by a constant angle such as about 180°, about 120°, or about 90°.
- the supporting pin rotary movement mechanism may include a device that rotates by a constant pre-selected angle by using air pressure as well as an electric means such as the step motor.
- FIG. 3 is a cross-sectional view of the lateral flow deposition apparatus.
- the illustrated lateral flow deposition apparatus includes a plurality of lateral flow reaction chambers, and a substrate moving mechanism for moving a plurality of substrates.
- the reaction chambers are arranged to form a path.
- the substrate moving mechanism serves to move the substrate from one reaction to another along the path during a deposition circuit.
- the substrates are processed in at least two of the reaction chambers during the deposition circuit, i.e., a film having the desired thickness is formed on a substrate by deposition steps performed in two or more of the reaction chambers.
- the reaction chambers and the substrate moving mechanism are together configured to provide different relative orientations between the substrates and the gas flow directions in different reaction chambers.
- the gas flow directions in the reaction chambers are fixed and substantially parallel to one another, but the substrates are rotated less than 360° (relative to the common gas flow direction) by the substrate moving mechanism when they are transferred from one reaction chamber to another.
- the gas flow directions relative to the substrates are different in different reaction chambers.
- the deposition apparatus of FIG. 3 includes a plurality of reaction chambers.
- the deposition apparatus includes reactor covers 301 a and 301 b , substrate holders 360 a and 360 b , and substrate supporting pins 361 a and 361 b inserted into the substrate holders 360 a and 360 b .
- the reactor covers 301 a and 301 b and the substrate holders 360 a and 360 b define a plurality of reaction chambers or reaction spaces in which substrates are processed.
- Each of the reactor covers 301 a and 301 b includes gas inlets 310 and 312 configured to supply process gases into the reaction chamber, and a gas outlet 320 configured to exhaust gas from the reaction chamber.
- One of the gas inlets 310 and 312 may be omitted, particularly for CVD, but for ALD a separate inlet for each reactant is preferred.
- each of the inlets 310 may be connected to each of reactant gas supply tubes symmetrically diverging from one reactant source supply apparatus, and similarly for 312 .
- each reaction chamber is configured to vapor deposit the same material.
- exhaust tubes connected to the each gas outlet 320 may be converging symmetrically to one exhaust tube connected to an external exhaust vacuum pump (not shown).
- Each of the reaction chambers also includes gas flow control guide structures 340 and 342 configured to maintain a substantially laminar gas flow over the substrates.
- Each of the gas flow control guide structures 340 and 342 may be configured to provide a gas flow in a fixed direction.
- the gas flow control guide structures 340 and 342 are configured to provide gas flows in substantially the same direction as each other in the reaction chambers.
- the deposition apparatus also includes a reactor base 372 configured to support both of the substrate holders 360 a and 360 b .
- the substrate holders 360 a and 360 b may be detachably fixed to the reactor base 372 while not being rotatable relative to the reactor base 372 when the chambers are closed for deposition.
- the deposition apparatus further includes supporting pins 361 a and 361 b configured to hold the substrates while moving the substrate holders 360 a and 360 b downward, and supporting pin holders 365 a and 365 b that are fixed relative to the outer wall 398 , configured to support the supporting pins 361 a and 362 b when the chambers are opened.
- the deposition apparatus includes a substrate transfer mechanism.
- the substrate transfer mechanism serves to horizontally rotate the substrate holders 360 a and 360 b during a deposition process.
- the substrate transfer mechanism may includes a plurality of driving guide posts 382 connected to an outer wall 398 , a lower fixing plate 381 to which the driving guide posts 382 are connected, a driving plate 383 connected to the driving guide posts 382 through bearings 386 , connecting supporters 373 into which projecting portions of the reactor base 372 are inserted, a feed-through 374 for rotation, an electric motor 375 , a pneumatic cylinder for vertical motion 384 , and a bellows 385 for allowing vertical motion while sealing the bottom of the reactor.
- the reactor base 372 may be moved vertically and may be rotated horizontally by the substrate transfer mechanism. First, vertical movement of the substrate transfer mechanism is described.
- the pneumatic cylinder 384 for vertical motion causes the driving plate 383 (to which the electric motor 375 and the feed-through 374 for rotation are connected) to move vertically.
- the vertical motion of the driving plate 383 is transferred to the reactor base 372 supporting the substrate holders 360 a and 360 b through the rotary posts 376 of the electric motor 375 and the connecting supporters 373 such that the substrate holders 360 a and 360 b may be moved vertically.
- the bellows 385 allows proper displacement while driving vertically.
- the substrate holders 360 a and 360 b and the reactor base 372 are moved downward such that the substrates are detached from the reaction chambers, but only to a vertical level that the substrate supporting pins 361 a and 361 b do not contact the supporting pin holders 365 a and 365 b .
- the electric motor 375 is rotated.
- the rotary motion of the electric motor 375 is transferred to the reactor base 372 through the feed-through 374 for rotation and the connecting supporters 373 such that the reactor base 372 is rotated.
- the substrate holders 360 a and 360 b are rotated such that the substrates on the substrate holders 360 a and 360 b are transferred from one reaction chamber to another reaction chamber.
- the substrate holders 360 a , 360 b are kept in the same position relative to the reactor base 372 , the substrates are rotated by 180° when they are transferred from one reaction chamber to another.
- a first portion of a desired film thickness is deposited on each substrate in each of the reaction chambers, and then a second portion of the desired film thickness (typically the same material) is deposited in the other of the reaction chambers, as will be better understood from description below.
- the deposition apparatus includes two reaction chambers.
- the deposition apparatus can include more than two reaction chambers.
- a deposition apparatus includes two to eight reaction chambers, and particularly two to four reaction chambers.
- substrates are loaded onto the substrate holders 360 a and 360 b , while supported by the supporting pin holders 361 a , 361 b .
- the reactor base 372 is then moved upward such that the bottom of the reactor cover 301 a contacts the substrate holder 360 a and the bottom of the reactor cover 301 b contacts the substrate holder 360 b respectively, thereby forming enclosed reaction spaces.
- Films having an intermediate thickness are formed on the substrates in the reaction chambers by sequentially supplying reactant gases into the reaction chambers.
- the intermediate thickness may be up to about 50% of a desired final thickness of the resulting film.
- the substrate holders 360 a and 360 b are moved downward by moving the reactor base 372 downward to the position shown in FIG. 3 .
- the reactor base 372 is rotated by about 180° such that the substrate holders 360 a and 360 b are positioned under different reactor covers.
- the substrates which have been under the reactor covers 301 a and 301 b , are moved to under the reactor covers 301 b and 301 a , respectively, by the rotation of the reactor base 372 , at the same time changing the substrate orientations relative to the outer walls 398 and the gas flow direction.
- the substrate holders 360 a and 360 b are moved upward such that the reactor cover 301 a contacts the substrate holder 360 b and the reactor cover 301 b contacts the substrate holder 360 a respectively, thereby forming enclosed reaction spaces.
- the preformed films on the substrates are grown to have the desired final thickness, e.g., another film having a thickness of about 50% of the desired final thickness is formed on each of the substrates.
- a resulting film may have non-uniformity (e.g., in thickness) between portions thereof in the upstream and downstream regions due to the fact that reactants are in a higher concentration in the upstream region than in the downstream region.
- films are deposited on substrates while the substrates are exposed to reactant gases flowing different directions (about 180° in the illustrated embodiment) in different reaction chambers.
- the reactant gases flow in the same direction in both chambers, while the substrates are rotated by 180° relative to that flow direction by rotation of the reactor base 372 . Accordingly, uniformity of a film deposited in the lateral flow deposition apparatus may be improved while two or more substrates may be processed simultaneously.
- a lateral flow deposition apparatus may include three or more substrate holders supporting three or more substrates.
- the three or more substrates are transferred from a reaction chamber to another such that they are exposed to different gas flows (relative to substrate orientation) in different reaction chambers.
- the deposition apparatus includes two to eight reaction chambers, and preferably two to four reaction chambers. Accordingly, the rotation angle of the substrate holders may be changed by the number of reaction chambers such that the rotation angle of the substrate holders may be about 180°, about 120°, and about 90° when the number of the reaction chambers is two, three, and four, respectively.
- FIG. 4A is a perspective view of the lateral flow deposition apparatus
- FIG. 4B is a top plan view of the lateral flow deposition apparatus of FIG. 4A .
- the lateral flow deposition apparatus includes a plurality of lateral flow reaction chambers, and a substrate transfer mechanism for transferring a plurality of substrates loaded in the reaction chambers among the reaction chambers.
- the gas flow directions in the reaction chambers are fixed and substantially parallel to one another, but the substrates are rotated relative to the gas flow direction less than 360° by the substrate moving mechanism when they are transferred from one reaction chamber to another. As a result, the gas flow directions relative to the substrates are different in different reaction chambers.
- the chamber 400 includes three reaction chambers.
- Each of the reaction chambers respectively includes a reactor cover 410 a , 410 b , 410 c , a substrate holder 420 a , 420 b , and 420 c , and a supporting pin 460 a , 460 b , and 460 c inserted into the substrate holder 420 a , 420 b , and 420 c .
- Each of the reactor covers 410 a , 410 b , and 410 c defines a reaction space along with one of the substrate holders 420 a , 420 b , and 420 c .
- Each of the reactor covers 410 a , 410 b , and 410 c includes at least one gas inlet 402 a , 402 b , and 402 c and a gas outlet 404 a , 404 b , and 404 c , and is fixed to the cover of the chamber 400 by a fastening mechanism 406 a - 406 c .
- the reactor cover also includes a gas flow control guide structure (not shown) configured to provide a substantially laminar gas flow over substrates.
- gas inlets 402 a , 402 b , and 402 c and the gas outlets 404 a , 404 b , and 404 c are provided in the reactor cover, and the gas inlets 402 a , 402 b , and 402 c and the gas outlets 404 a , 404 b , and 404 c are connected respectively to a separate gas supply device (not shown) and an exhaust device (not shown), in FIG. 4A , a single gas supply device may be provided in the reactor cover.
- the gas inlets 402 a , 402 b , and 402 c may be connected to each of gas supply tubes symmetrically diverged from the one gas supply device toward the reaction chambers, respectively.
- each of gas outlets 404 a , 404 b , and 404 c may be connected to an external exhaust vacuum pump (not shown) in the manner that exhaust tubes connected to each of gas outlets 404 a , 404 b , and 404 c may be symmetrically converged to one exhaust tube connected to an external exhaust vacuum pump (not shown).
- the substrate holders 420 a , 420 b , and 420 c may include substrate heaters (not shown) configured to heat the substrate holders and the substrates.
- the substrate holders 420 a , 420 b , and 420 c may move vertically such that the substrate holders 420 a , 420 b , and 420 c define reaction spaces by contacting to the reactor covers 410 a , 410 b , and 410 c.
- the reactor 400 includes supporting pins 460 a , 460 b , and 460 c configured to support the substrates while moving downward the substrate holders 420 a , 420 b , and 420 c .
- the supporting pin may have a different shape and may be arranged differently. For example, three supporting pins that are in point contact with each substrate at positions away from the center of each substrate may be used for the supporting pin.
- a substrate entrance 440 for a loading and unloading path of the substrates is provided at one side of the chamber exterior wall.
- the substrate may be loaded to or unloaded from each reaction chamber through the substrate entrance 440 .
- the illustrated substrate transfer mechanism includes a plurality of arms 490 a , 490 b , and 490 c that are configured to load or unload the substrates, and an arm axis 492 connecting to the plurality of arms 490 a , 490 b , and 490 c.
- the arm axis 492 may be connected to an arm driving mechanism that is configured to drive the arm axis 492 to move vertically and rotate horizontally.
- the arms 490 a , 490 b , and 490 c may support the substrates, while not preventing the supporting pins 460 a , 460 b , and 460 c from moving vertically.
- the arms 490 a , 490 b , and 490 c have a hook shape.
- the arms may have other shapes that may support the substrates while not preventing vertical movement of supporting pins.
- the arms 490 a , 490 b , and 490 c sequentially receive three substrates entering through the substrate entrance 440 and then load the substrates on the supporting pins 460 a , 460 b , and 460 c , respectively, by lowering the arms 490 a , 490 b , and 490 c and/or raising the supporting pins 460 a , 460 b , 460 c .
- the arms 490 a , 490 b , and 490 c are positioned as shown in FIG. 4B such that the arms 490 a , 490 b , and 490 c may not prevent the substrate holders 420 a , 420 b , and 420 c from moving vertically.
- the deposition apparatus may include two to eight reaction chambers, and preferably includes two to four reaction chambers.
- the reactor covers 410 a , 410 b , 410 c and the substrate holders 420 a , 420 b , 420 c are contacted with each other to define enclosed reaction spaces.
- sub-films having a first intermediate thickness are formed on the substrates by sequentially supplying reactant gases into the reaction chambers.
- the first intermediate thickness may be about 1 ⁇ 3 of a desired final thickness.
- the substrate holders 420 a , 420 b , and 420 c are moved downward.
- the substrate loaded on the substrate holder 420 a is transferred to the substrate holder 420 b
- the substrate loaded on the substrate holder 420 b is transferred to the substrate holder 420 c
- the substrate loaded on the substrate holder 420 c is transferred to the substrate holder 420 a by raising, rotating 120°, and lowering the arm axis 492 .
- the substrate holders 420 a , 420 b , and 420 c move vertically, but do not rotate in a horizontal direction.
- the substrate holders 420 a , 420 b , and 420 c are moved upward to form enclosed reaction spaces.
- the second sub-films on the substrates are grown to a second intermediate thickness by sequentially supplying reactant gases into the reaction chambers.
- the second intermediate thickness may be about 2 ⁇ 3 of the desired final thickness, i.e., another sub-film (preferably of the same material) having about 1 ⁇ 3 of the final thickness is deposited during this step.
- the supply of the reactant gases is again stopped and the substrate holders 420 a , 420 b , and 420 c are again moved downward.
- the substrate loaded on the substrate holder 420 a is transferred to the substrate holder 420 b
- the substrate loaded on the substrate holder 420 b is transferred to the substrate holder 420 c
- the substrate loaded on the substrate holder 420 c is transferred to the substrate holder 420 a by the arm axis 492 .
- the substrate holders 420 a , 420 b , and 420 c are moved upward to form enclosed reaction spaces.
- the films on the substrates are grown with another sub-film thickness by sequentially supplying reactant gases (for an ALD example) into the reaction chambers, e.g., another film having about 1 ⁇ 3 of the final thickness is deposited during this step.
- films are deposited while exposing the substrates to different flow directions (relative to the substrate orientation) in different chambers. Accordingly, a film having a uniform thickness may be deposited in the lateral flow deposition apparatus and a plurality of substrates may be processed simultaneously.
- the deposition apparatus may include two to eight reaction chambers, and preferably includes two to four reaction chambers as described above.
- the rotation angle of the substrates may be changed by the number of reaction chambers such that the rotation angle of the substrate holders may be about 180°, about 120°, and about 90° when the number of the reaction chambers is two, three, and four, respectively.
- FIG. 5 is a schematic plan view of a lateral flow deposition chamber having four reaction chambers according to another embodiment.
- the reactor 500 includes four reaction chambers 520 a , 520 b , 520 c , and 520 d .
- the gas flow direction in each reaction chamber is shown by arrows.
- films having a thickness of about 1 ⁇ 4 of a desired thickness are formed on substrates under the state in which the substrates are loaded on four reaction chambers 520 a , 520 b , 520 c , and 520 d . Then the substrates are transferred to adjacent reaction chambers 520 b , 520 c , 520 d , and 520 a , respectively. Assuming that the substrates are rotated from chamber to chamber, the inner edge of the substrate maintains its orientation relative to the center of the reactor 500 , but the orientation relative to the gas flow changes. The above processes are repeated four times, each stage depositing about 1 ⁇ 4 of the desired film thickness, to deposit a film having the desired thickness.
- each stage depositing about 1 ⁇ 8 of the desired film thickness. Accordingly, films are deposited while changing the flow direction of reactant gases on the substrates by 90° sequentially by transferring the plurality of substrates from one reaction chamber to another. For ALD reactions, each stage involves multiple cycles.
- a film having a desired thickness may be formed by dividing the desired thickness of the film into two using the deposition apparatus of FIG. 5 .
- Films having a thickness of about 1 ⁇ 2 of the desired thickness may be formed on substrates while the substrates are loaded in four reaction chambers 520 a , 520 b , 520 c , and 520 d . Then, the substrates are transferred to the opposite reaction chambers 520 c , 520 d , 520 a , and 520 b respectively, instead of the adjacent reaction chambers 520 b , 520 c , 520 d , and 520 a . Additional films having a thickness of about 1 ⁇ 2 of the desired thickness are formed on the substrates in the opposite reaction chambers.
- FIG. 6 is a cross-sectional view of the lateral flow deposition apparatus.
- the illustrated lateral flow deposition apparatus includes a plurality of independent reaction chambers 620 a - 620 d and a transferring module 610 configured to load, unload, or transfer substrates between the reaction chambers 620 a - 620 d .
- the transferring module 610 may include a robot arm.
- the gas flow on the substrate is maintained substantially lateral, and the gas flow direction in each reaction chamber is shown by arrows in FIG. 6 .
- the gas flow directions in the reaction chambers 620 a - 620 d are constant and different from one another, relative to the center of the transfer module.
- at least two of the reaction chambers 620 a - 620 d have opposite gas flow directions from each other, relative to the center of the transfer module.
- Two substrates are loaded on two reaction chambers having the opposite gas flow directions among the reaction chambers 620 a - 620 d using the transferring module 610 .
- Films having a thickness of about 1 ⁇ 2 of a desired thickness are formed on the substrates.
- the two substrates are transferred to the other reaction chambers having the opposite gas flow directions by using the transferring module 610 .
- Other films having a thickness of about 1 ⁇ 2 of the desired thickness are formed on the preformed films on the substrates.
- films are deposited while changing the flow direction of reactant gases on the substrates by transferring the substrates between the reaction chambers having the opposite gas flow directions, thereby depositing films having a uniform thickness. It will be understood that other portions of the desired film thickness can be selected, and twice as many transfers are needed if 1 ⁇ 4 of the deposition is conducted at each stage.
- the number of process modules to process in each reaction chamber may depend on the number of gas flow directions in each reaction chamber. Accordingly, if the number of gas flow directions in each reaction chamber is too numerous, too many process modules are used to deposit films. Therefore, it is preferable that the number of process modules is not too many.
- the lateral flow deposition apparatus shown in FIG. 6 includes only two reaction chambers having opposite gas flow directions per film ( 620 a , 620 b for one film and 620 c , 620 d for another), so efficiency of the deposition apparatus may be improved. In other embodiments, the deposition apparatus may have four reaction chambers per film, depending on plumbing and programming.
- FIG. 6 “opposite” flow patterns are determined relative to a center of the transferring modules. While the mechanism of transfer differs, each of FIGS. 3 , 4 B, 5 , and 6 effectively employ rotational transfer, such that substrate orientations remain fixed relative to a radial direction (relative to the reactor or cluster tool center). In the case of FIG. 6 , a wafer handling robot, with an axis of rotation at the center, may load/unload wafers.
- the cluster deposition apparatus having independent process modules instead of a plurality of reaction chambers in one reactor may be applied to the deposition method according to embodiments of the present invention.
- the illustrated deposition apparatus 700 includes four reaction chambers 710 a - 710 d and a robot arm 730 .
- Each of the reaction chambers 710 a - 710 d is used to process a single substrate 720 a - 720 d at a time.
- Each of the reaction chambers 710 a - 710 d is configured to provide a laminar reaction gas flow over the substrate 720 a - 720 d processed therein.
- the gas flow directions in the reaction chambers 710 a - 710 d are denoted by arrows in the chambers 710 a - 710 d .
- reaction chambers 710 a - 710 d are arranged to form a substantially half circle, and all the gas flow directions extend radially from the center of the half circle toward the periphery of the half circle, and thus can be considered to have the same gas flow orientations relative to the center of the deposition apparatus 700 .
- the robot arm 730 is configured to transfer a substrate from one of the reaction chambers 710 a - 710 d to another.
- the robot arm 730 may rotate the substrate such that the substrate is in different orientations relative to the gas flow directions in different reaction chambers 710 a - 710 d .
- the robot arm 730 can have a mechanism to rotate a substrate while the substrate is held by the robot arm 730 .
- the robot 730 can work in conjunction with a stand-alone alignment device, which can change the substrate angular orientation relative to the robot 720 and effector, and thus relative to the gas flow directions.
- the number of chambers may be selected depending on how many deposition circuits are performed to form a film.
- either the substrate orientation or gas flow direction is changed to provide different relative positions between the substrate orientation and the gas flow direction.
- such different relative positions can also be achieved by changing both the substrate orientation and the gas flow direction.
Abstract
A deposition apparatus and deposition method for forming a film on a substrate are disclosed. A film is deposited on a substrate by exposing the substrate to different flow directions of reactant gases. In one embodiment, the substrate is rotated in the reaction chamber after a film having an intermediate thickness is formed on the substrate. In other embodiments, the substrate is transferred from one reaction chamber to another after a film having an intermediate thickness is formed on the substrate. Accordingly, a film having a uniform thickness is deposited, averaging out depletion effect.
Description
- This application claims priority to and the benefit of Korean Patent Application No. 10-2007-0032422 filed in the Korean Intellectual Property Office on Apr. 2, 2007, the entire contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a lateral flow deposition apparatus and a method of depositing a film by using the apparatus.
- 2. Description of the Related Art
- In manufacturing semiconductor devices, efforts for improving apparatus and processes to form a high quality thin film on a substrate are continuing. In atomic layer deposition (ALD) methods, separate pulses of at least two reactants are sequentially introduced to a substrate and a surface reaction between the reactants and the surface of the substrate occurs to form a monolayer on the surface of the substrate. The reactants are sequentially introduced until a desired thickness of the deposited material is formed. In pure ALD methods, the reactants are pulsed separately within a temperature range above the reactants' condensation temperatures and below their thermal decomposition temperatures. The thin film is formed by surface reaction, and thus a thin film having a uniform thickness may be formed on the entire surface of the substrate regardless of surface roughness of the substrate. In addition, impurities in the thin film may be reduced to form a high quality thin film.
- In a simple example of an atomic layer deposition method, gas pulses consisting of four sequential steps including first reactant gas supply, inert purge gas supply, second reactant gas supply, and inert purge gas supply are repeated. A pulse of a purge gas between the pulses of the different reactants reduces the gas phase reactions of the reactants due to excess amounts of the reactants remaining in the chamber such that a thin film is formed by a surface reaction occurring on the surface of the substrate. Here, a portion of the reactant gases may be activated by plasma. A plasma atomic layer deposition method of generating discontinuous plasma in line with the pulses of the reactant gases in a reaction chamber is disclosed in Korean Patent No. 273473 and U.S. Pat. No. 6,645,574.
- Among the atomic layer deposition apparatuses used in the ALD methods, a lateral flow ALD reactor, in which gases flow laterally over and parallel to the surface of a substrate, has been proposed. In the lateral flow ALD reaction chamber, flow of the gases is rapid and simple and thereby reactant gases can be switched and purged rapidly to reduce time required for supplying process gases sequentially. An example of lateral flow reactor suitable for time-divided gas supplying ALD method and a method of depositing a thin film using the lateral flow reactor have been disclosed in Korean Patent No. 624030 and U.S. Pat. No. 6,539,891. In addition, an improved example of the lateral flow reactor suitable for time-divided gas supplying ALD method and a method of depositing a thin film using the lateral flow reactor have been disclosed in Korean Patent Application No. 2005-0038606 and U.S. patent application Ser. No. 11/429,533 published as U.S. Publication No. 2006-0249077 A1 on Nov. 9, 2006. Here, the plasma atomic layer deposition method of generating discontinuous plasma may be applied to the lateral flow reactor by supplying RF power to the electrode in line with the pulses of the reactants gases.
- Other examples of lateral flow ALD reactors have been disclosed in U.S. Pat. No. 5,711,811 and U.S. Pat. No. 6,562,140. In these examples, the reactors have a constant gap between a portion supporting a substrate and another portion facing a surface of the substrate such that gas flowing over the substrate may be constant and maintained substantially laminar.
- The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
- One embodiment is a method of depositing a film over a substrate. The method includes in sequence: flowing one or more reactant gases horizontally over a substrate in a first direction relative to the substrate until a first film having a first thickness is formed over the substrate; stopping flowing the reactant gases over the substrate; and flowing the reactant gases horizontally over the substrate in a second direction relative to the substrate until a second film having a second thickness is formed over the first film. The first thickness is thinner than a target thickness. The second thickness is thinner than the target thickness. The second direction is different from the first direction.
- Another embodiment is a method of depositing a film over a substrate. The method includes in sequence: flowing one or more reactant gases horizontally over a substrate in a first direction in a first reactor to form a first film over the substrate; transferring the substrate from the first reactor to a second reactor; and flowing the same reactant gases horizontally over the substrate in a second direction in the second reactor to form a second film over the first film. The second direction is different from the first direction relative to the substrate. The first and second films are formed of the same material.
- Yet another embodiment is an apparatus for depositing a thin film over a substrate. The apparatus includes: a reaction chamber configured to define an enclosed reaction space in which deposition is performed on a substrate. The reaction space is configured to provide a laminar gas flow in a direction over the substrate. The apparatus further includes a driver configured to rotate the substrate while deposition is not performed on the substrate such that the orientation of the substrate relative to the direction of the laminar gas flow is different from the orientation of the substrate before being rotated.
- Yet another embodiment is an apparatus for depositing a thin film over a substrate. The apparatus includes a plurality of reaction chambers. Each of the reaction chambers is configured to define an enclosed reaction space in which deposition is performed on a substrate. The reaction space is configured to provide a laminar gas flow in a direction over the substrate. The reaction chambers are configured to provide the same reactant gases as one another into the reaction spaces. The apparatus also includes a transfer device configured to transfer a substrate from one of the reaction chambers to another of the reaction chambers. The orientation of the substrate relative to the direction of the laminar gas flow in the one reaction chamber is different from the orientation of the substrate relative to the direction of the laminar gas flow in the other reaction chamber.
-
FIG. 1A andFIG. 1B are schematic plan views of a substrate illustrating a method of lateral flow deposition according to one embodiment. -
FIG. 2A andFIG. 2B are cross-sectional views of a lateral flow deposition apparatus according to one embodiment. -
FIG. 3 is a cross-sectional view of a lateral flow deposition apparatus according to another embodiment. -
FIG. 4A is a perspective view of a lateral flow deposition apparatus according to yet another embodiment. -
FIG. 4B is a top plan view of the lateral flow deposition apparatus ofFIG. 4A . -
FIG. 5 is a schematic top plan view of a lateral flow deposition chamber having four reaction chambers according to yet another embodiment. -
FIG. 6 is a schematic plan view of a lateral flow deposition apparatus according to yet another embodiment. -
FIG. 7 is a schematic plan view of a deposition apparatus including four reaction chambers and a robot arm programmed to rotate the substrate between transfers according to yet another embodiment. - The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.
- Films deposited in the lateral flow deposition reaction chambers described above may have a non-uniform thickness. In a lateral flow deposition apparatus, reactants typically flow from an upstream region to a downstream region in a chamber. Because a portion of the reactants is consumed for reaction with the surface of a substrate in the chamber while flowing from the upstream region to the downstream region, reactants are in a higher concentration in the upstream region than in the downstream region. Thus, a portion of the resulting film that is formed in the downstream region may be thinner than another portion of the film that is formed in the upstream region. Such effect is generally referred to as depletion effect. Furthermore, to the extent an ALD reaction exhibits non-ideal ALD behavior, such as CVD-type reactions between residual reactants or by-product and a subsequent pulse tend also to occur non-uniformly along the flow path.
- In one embodiment, a film having a desired thickness is formed on a substrate through multiple steps. A film having a first intermediate thickness thinner than the desired thickness is formed on the substrate during one of the steps, which may be CVD or include multiple ALD cycles. Then, the pre-formed film is grown to the desired thickness during one or more additional steps, each of which may be CVD or include multiple ALD cycles for depositing the same material. In these multiple steps, horizontal gas flows are provided over the substrate in different directions. These steps can be repeated until the film having the desired thickness is formed on the substrate. Because the substrate is exposed to gas flows in different directions during the multiple steps, depletion effects and/or other flow-axis non-uniformities on the substrate are averaged out. Thus, non-uniformity in thickness that would otherwise occur can be reduced or eliminated.
- Now, a deposition method according to one embodiment will be described with reference to
FIGS. 1A and 1B . As shown inFIG. 1A , a film is grown to have a selected intermediate thickness, for example, up to about 50% of a desired final thickness, by reactant gases flowing over asubstrate 10 in a first direction X. InFIG. 1A , a first portion A of thesubstrate 10 is located at an upstream position, and a second portion B of thesubstrate 10 is located at a downstream position. Then, the film is further grown to the desired final film thickness by reactant gases flowing over thesubstrate 10 in a second direction X′, as shown inFIG. 1B . In the illustrated embodiment, the second direction X′ is opposite from the first direction X, and thus, the first portion A is now located at a downstream position, and a second portion B is now located at an upstream position. -
FIGS. 1A and 1B should be understood to illustrate relative directions. The same result can be achieved by rotating the substrate 180°, rather than changing the direction of the flow over a stationary substrate. Similarly, in another embodiment, a film is grown on a substrate to have a selected intermediate thickness in a first reactor, and then the substrate is transferred to a second reactor. In the second reactor, gases flow over thesubstrate 10 in the second direction X′ to form the other 50% of the desired film. - Furthermore, while only a single switch in relative flow direction by 180° is described above, and for improving thickness uniformities better efficiently, in some circumstances, it may be advisable to increase the number of switches. For example, 25% of the film could be deposited in each of four steps with 3 rotations of 180° between steps. Similarly, 10% of the film could be deposited in each of 10 steps with 180° rotation in the relation of flow/substrate orientation between each step. Compositional non-uniformities (stoichiometry) can be better averaged out with greater number of steps, at the expense of efficiency.
- In another embodiment, the
substrate 10 may be rotated by about 180° in a reactor with a lateral gas flow in the first direction X after a film is grown to have a selected intermediate thickness. By the rotation of thesubstrate 10, thesubstrate 10 is now exposed to the same lateral gas flow, but in the opposite relative direction. - Although not shown here, instead of dividing the desired final thickness of the film into two (i.e., forming two stacked films, each having about 50% of the final thickness), the desired final thickness of the film may be divided into three. In other words, a film having a thickness of about one-third of the desired thickness may be formed on the substrate, and then the substrate may be rotated by about 120°. Then, a film having a thickness of about one-third of the desired thickness may again be formed on the substrate. Next, the substrate may be rotated by about 120° again, and a final one-third thickness of the film may be formed on the substrate.
- In other embodiments, the desired final thickness of the film may be divided into n, and about 1/n of the desired thickness of the film may be formed (e.g., by CVD for a duration or multiple ALD cycles) in a reactor in which gases flow in a constant direction, and the substrate may be rotated by about 360°/n each time. The above process may be repeated n times to form the film having the desired thickness. In one embodiment, n may be a natural number of 2 to 8, and particularly, n may be 2, 3, or 4.
- In other embodiments, the desired thickness of the film may be divided into n, and about 1/n of the desired thickness of the film may be formed in a reactor in which gases flow in a constant direction. Then, the substrate may be transferred into another reactor in which gases flow in a direction rotated by about 360°/n from the gas flow direction of the previous reactor. The above process may be repeated n times to form the film having the desired thickness. In one embodiment, n is a natural number of 2 to 8, and particularly n may be 2, 3, or 4.
- In the deposition methods described above, the deposition process of forming about 1/n of the desired thickness of the film in a reactor in which gases flow in a constant direction and rotating the substrate by about 360°/n may be repeated n times to form the film having the desired thickness. Alternatively, the deposition process of forming about 1/n of the desired thickness of the film in a reactor in which gases flow in a constant direction and transferring the substrate into another reactor in which gases flow in a direction rotated by about 360°/n from the gas flow direction in the previous reactor may be repeated n times to form the film having the desired thickness. Accordingly, a film having a substantially uniform thickness may be deposited in a lateral flow deposition apparatus.
- If n is excessively large, the time required for rotating or transferring the substrate is excessively long such that productivity of the deposition chamber may be decreased. However, in the deposition method described above, n is a natural number of 2 to 8, and preferably n is one of 2, 3, and 4, such that adverse effects on the productivity of the deposition chamber may be avoided. A skilled artisan will, however, appreciate that the number n can vary widely, depending on the deposition thickness and condition.
- In the embodiments described above, the substrate and/or flow direction is rotated about 360° during the entire deposition process. In certain embodiments, a substrate and/or flow direction may be rotated more than 360° during the entire deposition process. For example, a substrate and/or flow direction may be rotated about 360°×m, where m is equal to or greater than 2, depending on the desired film thickness. Desirably, m is an integer less than or equal to 4 in order to minimize time lost during adjustment of relative flow direction. However, for some types of non-uniformity (e.g., compositional non-uniformity), greater numbers of rotations m and/or greater numbers of rotational increments n will be beneficial. However, if m is greater than 4, using a non-integer or fractional m will not have too great an adverse effect on uniformity. A skilled artisan will appreciate that the substrate and/or flow direction can be rotated any suitable angle, depending on the desired film thickness and/or deposition chamber configuration.
- Now, a reaction chamber of a lateral flow deposition apparatus according to one embodiment will be described in detail with reference to
FIG. 2A andFIG. 2B .FIG. 2A andFIG. 2B are cross-sectional views of a lateral flow deposition apparatus according to one embodiment.FIG. 2A represents a lateral flow deposition apparatus during a depositing process andFIG. 2B represents a lateral flow deposition apparatus during an interval between depositing processes. - Referring to
FIG. 2A andFIG. 2B , a lateralflow deposition apparatus 100 according to one embodiment includes anouter wall 198, asubstrate holder 160, and areactor cover 101. Thereactor cover 101 and thesubstrate holder 160 together form a reaction chamber which defines areaction space 151 in which asubstrate 150 is processed. Thedeposition apparatus 100 also includesseparate gas inlets reactor cover 101 and configured to supply process gases into the reaction chamber, agas outlet 120 connected to thereactor cover 101 and configured to exhaust gas from the reaction chamber, asubstrate heater 170 configured to heat thesubstrate holder 160, a substrate holder vertical movement mechanism configured to vertically move thesubstrate holder 160 and thesubstrate heater 170, and a substrate rotary movement mechanism configured to rotate thesubstrate 150 relative to the direction of flow. One of thegas inlets - The
reactor cover 101 may also include acover heater 130 on outer surfaces of thereactor cover 101 to heat thereactor cover 101. The lateralflow deposition apparatus 100 may also include gas flowcontrol guide structures control guide structures substrate 150. The lateral gas flow may be a substantially laminar flow. - The substrate vertical movement mechanism may include three or more
supporting rods substrate holder 160, and a driving device (not shown), such as a pneumatic cylinder. The driving device is configured to move the supportingrods - The substrate rotary movement mechanism may include a supporting
pin 172 holding thesubstrate 150, a supportingpin holder 173 in which the supportingpin 172 is inserted, and a supporting pin rotary movement mechanism connected to the supportingpin holder 173. The supporting pin rotary movement mechanism may include anelectric motor 175 such as a step motor, a feed-through 174 for rotation connected to theelectric motor 175, a fixingplate 176 equipped with theelectric motor 175, and a fixingrod 177 connected to the fixingplate 176. The lateralflow deposition apparatus 100 may further include a supporting pin vertical movement mechanism (not shown) configured to move the supportingpin 172 in a vertical direction. The supporting pin vertical movement mechanism may include an electric motor and a pneumatic cylinder. Alternatively, the substrate can be lifted from thesubstrate holder 160 by interaction of the supportingpin 172 with the supportingpin holder 173 during downward movement of thesubstrate holder 160. - A part of the lower portion of the supporting
pin 172 inserted into the supportingpin holder 173 is chamfered such that the lower portion below the supportingpin 172 does not have a complete cylindrical shape. Accordingly, a rotary motion of the supporting pin rotary movement mechanism is effectively transferred to the supportingpin 172 through the supportingpin holder 173. The supportingpin 172 may be moved to a vertical direction along with the supportingpin holder 173. - The supporting pin rotary movement mechanism may include a device that is able to rotate by a predetermined angle using air pressure as well as electric means such as the
electric motor 175. - Now, a deposition method according to one embodiment using the lateral flow deposition apparatus shown in
FIG. 2A andFIG. 2B will be described in detail. First, asubstrate 150 is loaded onto thesubstrate holder 160, in the position ofFIG. 2B . Then, thesubstrate holder 160 is moved upward to contact thereactor cover 101 to define areaction space 151 in the position ofFIG. 2A . A film having a thickness of up to about 50% of a desired final thickness is formed by sequentially supplying reactant gases, e.g., by CVD or in a plurality of ALD cycles alternating two or more reactants, into thereaction space 151, as shown inFIG. 2A . - Next, the supply of the reactant gases is stopped and the
substrate holder 160 is moved downward using the substrate holder vertical movement mechanism as shown inFIG. 2B . Here, the supportingpin 172 interacts with the supportingpin holder 173 such that it is not moved downward such that thesubstrate 150 is detached from thesubstrate holder 160. After thesubstrate 150 is detached from thesubstrate holder 160, theelectric motor 175 is rotated. The rotary motion of themotor 175 is transferred to the supportingpin 172 and thesubstrate 150 through the feed-through 174 such that the supportingpin 172 and thesubstrate 150 are rotated by about 180°. Then, thesubstrate holder 160 is moved upward using the substrate holder vertical movement mechanism such that thesubstrate holder 160 contacts thereactor cover 101 to define thereaction space 151, as shown inFIG. 2A . The preformed film is further grown, e.g., by CVD or another plurality of ALD cycles to deposit the same material to have the desired final thickness by sequentially supplying reactant gases into thereaction space 151. - After the film having the desired thickness is formed, supply of the reactant gases is stopped and the
substrate holder 160 is moved downward. Here, the supportingpin 172 interacts with the supportingpin holder 173 such that it is not moved downward and thesubstrate 150 is detached from thesubstrate holder 160. Then, thesubstrate 150 is unloaded from the reactor using transfer equipment such as a robot arm (not shown), and another substrate may be loaded into the reactor. - If a robot arm that may not be moved in a vertical direction is used, the robot arm may be disposed at a position in a reactor suitable for transferring the substrate, and then the supporting
pin 172, the supportingpin holder 173 and the supporting pin rotary movement mechanism may be moved downward by using the supporting pin vertical movement mechanism. The supportingpin 172 is moved downward and the robot arm supports thesubstrate 150 when it is detached from the supportingpin 172. The robot arm is then moved outside of the reactor such that thesubstrate 150 is unloaded from the reactor and another substrate is loaded into the same position in which the supportingpin 172 supports thesubstrate 150. Next, the supportingpin 172, the supportingpin holder 173, and the supporting pin rotary movement mechanism are moved upward by using the supporting pin vertical movement mechanism such that the supportingpin 172 supports the new substrate and the robot arm is moved outside of the reactor. - Meanwhile, if a robot arm movable in a vertical direction is used, the substrate may be transferred without vertically moving the supporting
pin 172. Accordingly, the supporting pin vertical movement mechanism may be omitted. The supporting pin vertical movement mechanism may include an electric motor and a pneumatic cylinder. - In this case, the
substrate holder 160 is moved upward by using the substrate holder vertical movement mechanism such that thesubstrate holder 160 contacts thereactor cover 101 and the film having the desired thickness is deposited on the new substrate using the same method as described above. - Likewise, in one embodiment where the desired film is deposited by dividing in n times, a film having a thickness of about 1/n of the desired thickness is formed on the
substrate 150 in the reactor with gases flowing in a constant direction. After that, the supply of the reactant gases is stopped and thesubstrate 150 and the supportingpin 172 may be rotated by about 360°/n. The above process may be repeated n times to form a film having the desired thickness. - As described above, the supporting pin rotary movement mechanism rotates by a constant angle such as about 180°, about 120°, or about 90°. The supporting pin rotary movement mechanism may include a device that rotates by a constant pre-selected angle by using air pressure as well as an electric means such as the step motor.
- Now, a lateral flow deposition apparatus according to another embodiment will be described in detail with reference to
FIG. 3 .FIG. 3 is a cross-sectional view of the lateral flow deposition apparatus. - The illustrated lateral flow deposition apparatus includes a plurality of lateral flow reaction chambers, and a substrate moving mechanism for moving a plurality of substrates. The reaction chambers are arranged to form a path. The substrate moving mechanism serves to move the substrate from one reaction to another along the path during a deposition circuit. The substrates are processed in at least two of the reaction chambers during the deposition circuit, i.e., a film having the desired thickness is formed on a substrate by deposition steps performed in two or more of the reaction chambers. The reaction chambers and the substrate moving mechanism are together configured to provide different relative orientations between the substrates and the gas flow directions in different reaction chambers.
- In the illustrated embodiment, the gas flow directions in the reaction chambers are fixed and substantially parallel to one another, but the substrates are rotated less than 360° (relative to the common gas flow direction) by the substrate moving mechanism when they are transferred from one reaction chamber to another. As a result, the gas flow directions relative to the substrates are different in different reaction chambers.
- The deposition apparatus of
FIG. 3 includes a plurality of reaction chambers. The deposition apparatus includes reactor covers 301 a and 301 b,substrate holders substrate supporting pins substrate holders substrate holders - Each of the reactor covers 301 a and 301 b includes
gas inlets gas outlet 320 configured to exhaust gas from the reaction chamber. One of thegas inlets inlets 310 may be connected to each of reactant gas supply tubes symmetrically diverging from one reactant source supply apparatus, and similarly for 312. Thus, each reaction chamber is configured to vapor deposit the same material. In addition, exhaust tubes connected to the eachgas outlet 320 may be converging symmetrically to one exhaust tube connected to an external exhaust vacuum pump (not shown). - Each of the reaction chambers also includes gas flow
control guide structures control guide structures control guide structures - The deposition apparatus also includes a
reactor base 372 configured to support both of thesubstrate holders substrate holders reactor base 372 while not being rotatable relative to thereactor base 372 when the chambers are closed for deposition. The deposition apparatus further includes supportingpins substrate holders pin holders outer wall 398, configured to support the supportingpins 361 a and 362 b when the chambers are opened. - In addition, the deposition apparatus includes a substrate transfer mechanism. The substrate transfer mechanism serves to horizontally rotate the
substrate holders guide posts 382 connected to anouter wall 398, alower fixing plate 381 to which the drivingguide posts 382 are connected, a drivingplate 383 connected to the drivingguide posts 382 throughbearings 386, connectingsupporters 373 into which projecting portions of thereactor base 372 are inserted, a feed-through 374 for rotation, anelectric motor 375, a pneumatic cylinder forvertical motion 384, and abellows 385 for allowing vertical motion while sealing the bottom of the reactor. - The
reactor base 372 may be moved vertically and may be rotated horizontally by the substrate transfer mechanism. First, vertical movement of the substrate transfer mechanism is described. Thepneumatic cylinder 384 for vertical motion causes the driving plate 383 (to which theelectric motor 375 and the feed-through 374 for rotation are connected) to move vertically. The vertical motion of the drivingplate 383 is transferred to thereactor base 372 supporting thesubstrate holders rotary posts 376 of theelectric motor 375 and the connectingsupporters 373 such that thesubstrate holders bellows 385 allows proper displacement while driving vertically. - The
substrate holders reactor base 372 are moved downward such that the substrates are detached from the reaction chambers, but only to a vertical level that thesubstrate supporting pins pin holders electric motor 375 is rotated. The rotary motion of theelectric motor 375 is transferred to thereactor base 372 through the feed-through 374 for rotation and the connectingsupporters 373 such that thereactor base 372 is rotated. Accordingly, thesubstrate holders substrate holders - In the illustrated embodiment, because the
substrate holders reactor base 372, the substrates are rotated by 180° when they are transferred from one reaction chamber to another. During a deposition process, a first portion of a desired film thickness is deposited on each substrate in each of the reaction chambers, and then a second portion of the desired film thickness (typically the same material) is deposited in the other of the reaction chambers, as will be better understood from description below. - In the illustrated embodiment, the deposition apparatus includes two reaction chambers. A skilled artisan will, however, appreciate that the deposition apparatus can include more than two reaction chambers. In one embodiment, a deposition apparatus includes two to eight reaction chambers, and particularly two to four reaction chambers.
- Now, a deposition method according to one embodiment, using the lateral flow deposition apparatus of
FIG. 3 will be described in detail. First, substrates are loaded onto thesubstrate holders pin holders reactor base 372 is then moved upward such that the bottom of thereactor cover 301 a contacts thesubstrate holder 360 a and the bottom of thereactor cover 301 b contacts thesubstrate holder 360 b respectively, thereby forming enclosed reaction spaces. Films having an intermediate thickness are formed on the substrates in the reaction chambers by sequentially supplying reactant gases into the reaction chambers. In one example, the intermediate thickness may be up to about 50% of a desired final thickness of the resulting film. - Next, the supply of the reactant gases is stopped, and the
substrate holders reactor base 372 downward to the position shown inFIG. 3 . Then, thereactor base 372 is rotated by about 180° such that thesubstrate holders reactor base 372, at the same time changing the substrate orientations relative to theouter walls 398 and the gas flow direction. - Next, the
substrate holders reactor cover 301 a contacts thesubstrate holder 360 b and thereactor cover 301 b contacts thesubstrate holder 360 a respectively, thereby forming enclosed reaction spaces. Then, the preformed films on the substrates are grown to have the desired final thickness, e.g., another film having a thickness of about 50% of the desired final thickness is formed on each of the substrates. - After the films having the desired thickness have been formed, supply of the reactant gases is stopped and the
substrate holders - In a lateral flow deposition apparatus in which reactants flow from an upstream region to a downstream region, a resulting film may have non-uniformity (e.g., in thickness) between portions thereof in the upstream and downstream regions due to the fact that reactants are in a higher concentration in the upstream region than in the downstream region. In the embodiment described above, however, films are deposited on substrates while the substrates are exposed to reactant gases flowing different directions (about 180° in the illustrated embodiment) in different reaction chambers. In the example of
FIG. 3 , the reactant gases flow in the same direction in both chambers, while the substrates are rotated by 180° relative to that flow direction by rotation of thereactor base 372. Accordingly, uniformity of a film deposited in the lateral flow deposition apparatus may be improved while two or more substrates may be processed simultaneously. - In other embodiments, a lateral flow deposition apparatus may include three or more substrate holders supporting three or more substrates. The three or more substrates are transferred from a reaction chamber to another such that they are exposed to different gas flows (relative to substrate orientation) in different reaction chambers. In one embodiment, the deposition apparatus includes two to eight reaction chambers, and preferably two to four reaction chambers. Accordingly, the rotation angle of the substrate holders may be changed by the number of reaction chambers such that the rotation angle of the substrate holders may be about 180°, about 120°, and about 90° when the number of the reaction chambers is two, three, and four, respectively.
- Now, a lateral flow deposition apparatus according to another embodiment will be described in detail with reference to
FIG. 4A andFIG. 4B .FIG. 4A is a perspective view of the lateral flow deposition apparatus, andFIG. 4B is a top plan view of the lateral flow deposition apparatus ofFIG. 4A . - The lateral flow deposition apparatus according to this embodiment includes a plurality of lateral flow reaction chambers, and a substrate transfer mechanism for transferring a plurality of substrates loaded in the reaction chambers among the reaction chambers. The gas flow directions in the reaction chambers are fixed and substantially parallel to one another, but the substrates are rotated relative to the gas flow direction less than 360° by the substrate moving mechanism when they are transferred from one reaction chamber to another. As a result, the gas flow directions relative to the substrates are different in different reaction chambers.
- Referring to
FIG. 4A , thechamber 400 includes three reaction chambers. Each of the reaction chambers respectively includes areactor cover substrate holder pin substrate holder substrate holders gas inlet gas outlet chamber 400 by a fastening mechanism 406 a-406 c. The reactor cover also includes a gas flow control guide structure (not shown) configured to provide a substantially laminar gas flow over substrates. - Even though the
gas inlets gas outlets gas inlets gas outlets FIG. 4A , a single gas supply device may be provided in the reactor cover. Thegas inlets gas outlets gas outlets substrate holders - The
substrate holders substrate holders - The
reactor 400 includes supportingpins substrate holders FIG. 4A , the supporting pin may have a different shape and may be arranged differently. For example, three supporting pins that are in point contact with each substrate at positions away from the center of each substrate may be used for the supporting pin. - A
substrate entrance 440 for a loading and unloading path of the substrates is provided at one side of the chamber exterior wall. The substrate may be loaded to or unloaded from each reaction chamber through thesubstrate entrance 440. - Now, the substrate transfer mechanism in the lateral flow apparatus according to the present embodiment will be described with reference to
FIG. 4B . The illustrated substrate transfer mechanism includes a plurality ofarms arm axis 492 connecting to the plurality ofarms - The
arm axis 492 may be connected to an arm driving mechanism that is configured to drive thearm axis 492 to move vertically and rotate horizontally. Thearms pins - In
FIG. 4B , thearms - The
arms substrate entrance 440 and then load the substrates on the supportingpins arms pins pins arms FIG. 4B such that thearms substrate holders - Even though three reaction chambers are shown in
FIG. 4A andFIG. 4B , the deposition apparatus may include two to eight reaction chambers, and preferably includes two to four reaction chambers. - Now, a deposition method according to an embodiment using the lateral flow deposition apparatus shown in
FIG. 4A andFIG. 4B will be described in detail. First, substrates are loaded onto thesubstrate holders substrate holders - Next, the supply of the reactant gases is stopped and the
substrate holders substrate holder 420 a is transferred to thesubstrate holder 420 b, the substrate loaded on thesubstrate holder 420 b is transferred to thesubstrate holder 420 c, and the substrate loaded on thesubstrate holder 420 c is transferred to thesubstrate holder 420 a by raising, rotating 120°, and lowering thearm axis 492. Here, unlike the deposition apparatus shown inFIG. 3 , thesubstrate holders substrate holders - Next, the supply of the reactant gases is again stopped and the
substrate holders substrate holder 420 a is transferred to thesubstrate holder 420 b, the substrate loaded on thesubstrate holder 420 b is transferred to thesubstrate holder 420 c, and the substrate loaded on thesubstrate holder 420 c is transferred to thesubstrate holder 420 a by thearm axis 492. Next, when the substrates are positioned on the next substrate holders, thesubstrate holders - After the film having the desired thickness is formed, supply of the reactant gases is stopped and the
substrate holders - As described above, films are deposited while exposing the substrates to different flow directions (relative to the substrate orientation) in different chambers. Accordingly, a film having a uniform thickness may be deposited in the lateral flow deposition apparatus and a plurality of substrates may be processed simultaneously.
- Even though the present embodiment is described in a case of three reaction chambers, the deposition apparatus may include two to eight reaction chambers, and preferably includes two to four reaction chambers as described above. The rotation angle of the substrates may be changed by the number of reaction chambers such that the rotation angle of the substrate holders may be about 180°, about 120°, and about 90° when the number of the reaction chambers is two, three, and four, respectively.
- Now, a lateral flow deposition apparatus and a deposition method using the deposition apparatus according to another embodiment will be described with reference to
FIG. 5 .FIG. 5 is a schematic plan view of a lateral flow deposition chamber having four reaction chambers according to another embodiment. - Referring to
FIG. 5 , thereactor 500 includes fourreaction chambers FIG. 5 , the gas flow direction in each reaction chamber is shown by arrows. Now, the deposition method according to one embodiment, using the lateral flow deposition apparatus shown inFIG. 5 , will be described. - First, films having a thickness of about ¼ of a desired thickness are formed on substrates under the state in which the substrates are loaded on four
reaction chambers adjacent reaction chambers reactor 500, but the orientation relative to the gas flow changes. The above processes are repeated four times, each stage depositing about ¼ of the desired film thickness, to deposit a film having the desired thickness. On the other hand, if the desired film thickness is to be achieved in two circuits of thereaction chambers - In another embodiment, a film having a desired thickness may be formed by dividing the desired thickness of the film into two using the deposition apparatus of
FIG. 5 . Films having a thickness of about ½ of the desired thickness may be formed on substrates while the substrates are loaded in fourreaction chambers opposite reaction chambers adjacent reaction chambers - Now, a lateral flow deposition apparatus according to another embodiment will be described with reference to
FIG. 6 .FIG. 6 is a cross-sectional view of the lateral flow deposition apparatus. The illustrated lateral flow deposition apparatus includes a plurality of independent reaction chambers 620 a-620 d and atransferring module 610 configured to load, unload, or transfer substrates between the reaction chambers 620 a-620 d. The transferringmodule 610 may include a robot arm. - The gas flow on the substrate is maintained substantially lateral, and the gas flow direction in each reaction chamber is shown by arrows in
FIG. 6 . As shown inFIG. 6 , the gas flow directions in the reaction chambers 620 a-620 d are constant and different from one another, relative to the center of the transfer module. In addition, at least two of the reaction chambers 620 a-620 d have opposite gas flow directions from each other, relative to the center of the transfer module. - Now, the deposition method according to one embodiment, using the lateral flow deposition apparatus shown in
FIG. 6 will be described. Two substrates are loaded on two reaction chambers having the opposite gas flow directions among the reaction chambers 620 a-620 d using thetransferring module 610. Films having a thickness of about ½ of a desired thickness are formed on the substrates. Then, the two substrates are transferred to the other reaction chambers having the opposite gas flow directions by using thetransferring module 610. Other films having a thickness of about ½ of the desired thickness are formed on the preformed films on the substrates. Accordingly, films are deposited while changing the flow direction of reactant gases on the substrates by transferring the substrates between the reaction chambers having the opposite gas flow directions, thereby depositing films having a uniform thickness. It will be understood that other portions of the desired film thickness can be selected, and twice as many transfers are needed if ¼ of the deposition is conducted at each stage. - The number of process modules to process in each reaction chamber may depend on the number of gas flow directions in each reaction chamber. Accordingly, if the number of gas flow directions in each reaction chamber is too numerous, too many process modules are used to deposit films. Therefore, it is preferable that the number of process modules is not too many. The lateral flow deposition apparatus shown in
FIG. 6 includes only two reaction chambers having opposite gas flow directions per film (620 a, 620 b for one film and 620 c, 620 d for another), so efficiency of the deposition apparatus may be improved. In other embodiments, the deposition apparatus may have four reaction chambers per film, depending on plumbing and programming. - In
FIG. 6 , “opposite” flow patterns are determined relative to a center of the transferring modules. While the mechanism of transfer differs, each ofFIGS. 3 , 4B, 5, and 6 effectively employ rotational transfer, such that substrate orientations remain fixed relative to a radial direction (relative to the reactor or cluster tool center). In the case ofFIG. 6 , a wafer handling robot, with an axis of rotation at the center, may load/unload wafers. - As described above, the cluster deposition apparatus having independent process modules instead of a plurality of reaction chambers in one reactor may be applied to the deposition method according to embodiments of the present invention.
- Referring to
FIG. 7 , another embodiment of deposition apparatus will be described below. The illustrateddeposition apparatus 700 includes four reaction chambers 710 a-710 d and arobot arm 730. Each of the reaction chambers 710 a-710 d is used to process a single substrate 720 a-720 d at a time. Each of the reaction chambers 710 a-710 d is configured to provide a laminar reaction gas flow over the substrate 720 a-720 d processed therein. The gas flow directions in the reaction chambers 710 a-710 d are denoted by arrows in the chambers 710 a-710 d. In the illustrated embodiment, the reaction chambers 710 a-710 d are arranged to form a substantially half circle, and all the gas flow directions extend radially from the center of the half circle toward the periphery of the half circle, and thus can be considered to have the same gas flow orientations relative to the center of thedeposition apparatus 700. - The
robot arm 730 is configured to transfer a substrate from one of the reaction chambers 710 a-710 d to another. When transferring the substrate, therobot arm 730 may rotate the substrate such that the substrate is in different orientations relative to the gas flow directions in different reaction chambers 710 a-710 d. Therobot arm 730 can have a mechanism to rotate a substrate while the substrate is held by therobot arm 730. Alternatively, therobot 730 can work in conjunction with a stand-alone alignment device, which can change the substrate angular orientation relative to the robot 720 and effector, and thus relative to the gas flow directions. As withFIG. 7 , the number of chambers may be selected depending on how many deposition circuits are performed to form a film. The fewer the number of deposition circuits is, the better efficient the deposition process is. However, the more the number of deposition circuits is, the more uniformity the resulting film has. Details of a process of forming a film using theapparatus 700 can be as described above with respect to the above embodiments, except for the configurations of the reaction chambers and the use of the robot arm. A skilled artisan will appreciate that the reaction chambers can be arranged any suitable manner, and the robot arm can adjust the orientation of the substrate, depending on the arrangement of the reaction chambers and their gas flow directions. - In the embodiments described above, either the substrate orientation or gas flow direction is changed to provide different relative positions between the substrate orientation and the gas flow direction. In other embodiments, such different relative positions can also be achieved by changing both the substrate orientation and the gas flow direction.
- While this invention has been described in connection with what is considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (33)
1. A method of depositing a film over a substrate, the method comprising in sequence:
flowing one or more reactant gases horizontally over a substrate in a first direction relative to the substrate until a first film having a first thickness is formed over the substrate, the first thickness being thinner than a target thickness;
stopping flowing the reactant gases over the substrate; and
flowing the reactant gases horizontally over the substrate in a second direction relative to the substrate until a second film having a second thickness is formed over the first film, the second thickness being thinner than the target thickness, the second direction being different from the first direction.
2. The method of claim 1 , wherein each of the first and second thicknesses is about 1/n of the target thickness, where n is a natural number equal to or greater than 2.
3. The method of claim 2 , wherein n is a natural number of 2 to 8.
4. The method of claim 1 , wherein the second direction is different in angle from the first direction by about 360°/n, n being a natural number equal to or greater than 2.
5. The method of claim 1 , wherein the method comprises maintaining the flow direction of the reactant gases constant, and wherein the method further comprises rotating the substrate while stopping flowing the reactant gases.
6. The method of claim 1 , wherein the method comprises maintaining the orientation of the substrate constant, and wherein the method further comprises changing the direction of the reactant gases for flowing the reactant gases in the second direction.
7. The method of claim 1 , wherein the method comprises changing the orientation of the substrate and changing the direction of the reactant gases for flowing the reactant gases in the second direction.
8. A method of depositing a film over a substrate, the method comprising in sequence:
flowing one or more reactant gases horizontally over a substrate in a first direction in a first reactor to form a first film over the substrate;
transferring the substrate from the first reactor to a second reactor; and
flowing the same reactant gases horizontally over the substrate in a second direction in the second reactor to form a second film over the first film, the second direction being different from the first direction relative to the substrate, the first and second films being formed of the same material.
9. The method of claim 8 , wherein the first film has a first thickness thinner than a target thickness, and wherein the second film has a second thickness thinner than the target thickness.
10. The method of claim 9 , wherein each of the first and second thicknesses is about 1/n of the target thickness, where n is a natural number equal to or greater than 2.
11. The method of claim 10 , wherein n is a natural number of 2 to 8.
12. The method of claim 8 , wherein the second direction is different in angle from the first direction by about 360°/n, n being a natural number equal to or greater than 2.
13. The method of claim 8 , wherein the direction of the reactant gases in the first reactor is substantially parallel to the direction of the reactant gases in the second reactor, and wherein transferring the substrate comprises rotating the substrate.
14. The method of claim 8 , wherein the direction of the reactant gases in the first reactor is different in angle from the direction of the reactant gases in the second reactor.
15. The method of claim 8 , wherein the direction of the reactant gases in the first reactor is different in angle from the direction of the reactant gases in the second reactor, and wherein transferring the substrate comprises rotating the substrate.
16. An apparatus for depositing a thin film over a substrate, the apparatus comprising:
a reaction chamber configured to define an enclosed reaction space in which deposition is performed on a substrate, the reaction space being configured to provide a laminar gas flow in a direction over the substrate; and
a driver configured to rotate the substrate while deposition is not performed on the substrate such that the orientation of the substrate relative to the direction of the laminar gas flow is different from the orientation of the substrate before being rotated.
17. The apparatus of claim 16 , wherein the reaction chamber further comprises a reactor cover and a substrate holder together configured to form the reaction chamber, and wherein the reactor cover and the substrate holder are configured to be separated from each other while the driver rotates the substrate.
18. The apparatus of claim 16 , further comprising a gas flow control guide structure configured to define the reaction space with the substrate holder.
19. The apparatus of claim 17 , further comprising a supporting pin configured to support the substrate while the reactor cover and the substrate are separated from each other, wherein the driver is configured to rotate the supporting pin.
20. The apparatus of claim 16 , wherein the driver is configured to rotate the substrate by an angle of about 360°/n at a time, and wherein n is a natural number greater than 2.
21. The apparatus of claim 20 , wherein n is a natural number of 2 to 8.
22. An apparatus for depositing a thin film over a substrate, the apparatus comprising:
a plurality of reaction chambers, each of the reaction chambers being configured to define an enclosed reaction space in which deposition is performed on a substrate, the reaction space being configured to provide a laminar gas flow in a direction over the substrate, the reaction chambers being configured to provide the same reactant gases as one another into the reaction spaces; and
a transfer device configured to transfer a substrate from one of the reaction chambers to another of the reaction chambers, wherein the orientation of the substrate relative to the direction of the laminar gas flow in the one reaction chamber is different from the orientation of the substrate relative to the direction of the laminar gas flow in the other reaction chamber.
23. The apparatus of claim 22 , wherein the reaction chambers are configured to provide the reactant gases in substantially the same direction as one another, and wherein the transfer device is further configured to rotate the substrate while transferring the substrate from the one reaction chamber to the other reaction chamber.
24. The apparatus of claim 23 , wherein each of the reaction chambers further comprises a reactor cover and a substrate holder together configured to form the reaction chamber, and wherein the reactor cover and the substrate holder of each of the reaction chambers are configured to be separated from each other while the transfer device rotates the substrate.
25. The apparatus of claim 24 , wherein each of the reaction chambers further comprises a gas flow control guide structure configured to define the reaction space with the substrate holder.
26. The apparatus of claim 24 , further comprising a reactor base configured to support the substrate holders of the reaction chambers at least while the reactor cover and the substrate holder of each of the reaction chambers are separated from each other, wherein the transfer device is configured to rotate the reactor base.
27. The apparatus of claim 24 , wherein the transfer device comprises one or more arms, each of the arms being configured to support a substrate while the reactor cover and the substrate holder of each of the reaction chambers are separated from each other, and wherein the one or more arms are configured to transfer the substrate from the one reaction chamber to the other reaction chamber.
28. The apparatus of claim 27 , wherein the reaction chambers are arranged to form a substantially enclosed path, wherein the apparatus further comprises an arm axis positioned substantially in the center of the path, and coupled to the one or more arms, and wherein the arm axis is configured to rotate the one or more arms.
29. The apparatus of claim 22 , wherein at least two of the reaction chambers are configured to provide the reactant gases in different directions from one another.
30. The apparatus of claim 29 , wherein the at least two of the reaction chambers are configured to provide the reactant gases in directions that are different in angle by about 360°/n.
31. The apparatus of claim 22 , wherein the transfer device is configured to rotate the substrate by an angle of about 360°/n when transferring the substrate from the one reaction chamber to the other reaction chamber, and wherein n is a natural number greater than 2.
32. The apparatus of claim 31 , wherein n is a natural number of 2 to 8.
33. The apparatus of claim 22 , wherein the transfer device comprises a robot arm configured to rotate the substrate such that the orientation of the substrate relative to the direction of the laminar gas flow in the one reaction chamber is different from the orientation of the substrate relative to the direction of the laminar gas flow in the other reaction chamber.
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US12/058,364 Abandoned US20080241384A1 (en) | 2007-04-02 | 2008-03-28 | Lateral flow deposition apparatus and method of depositing film by using the apparatus |
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US11959168B2 (en) | 2021-04-26 | 2024-04-16 | Asm Ip Holding B.V. | Solid source precursor vessel |
USD980813S1 (en) | 2021-05-11 | 2023-03-14 | Asm Ip Holding B.V. | Gas flow control plate for substrate processing apparatus |
USD981973S1 (en) | 2021-05-11 | 2023-03-28 | Asm Ip Holding B.V. | Reactor wall for substrate processing apparatus |
USD980814S1 (en) | 2021-05-11 | 2023-03-14 | Asm Ip Holding B.V. | Gas distributor for substrate processing apparatus |
USD990441S1 (en) | 2021-09-07 | 2023-06-27 | Asm Ip Holding B.V. | Gas flow control plate |
WO2023129142A1 (en) * | 2021-12-28 | 2023-07-06 | Applied Materials, Inc. | Electronic device manufacturing systems having paired deposition chambers for enhanced deposition uniformity |
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KR20080090328A (en) | 2008-10-08 |
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